Seat and back rest unit



FIG. 1 is a front elevational view of a seat and backrest unit showingmy design;

FIG. 2 is a side elevational view;

FIG. 3 is a rear elevational view; and

FIG. 4 is a top plan view thereof.

The side of the seat and backrest unit not shown is a mirror image ofthe side shown.

The ornamental design for a seat and backrest unit, as shown anddescribed.